Are there any changes that need to be made for Content API v2.1 migration for Google Merchant Centre?
For context -
As this is a technical question, you are best to ask Shopify Support.
However in general I would assume data feed solutions will handle the migration if they are still actively working on the app.
Then I recommend asking again. If you think about your question logically. This is something the developer of the app would be able to answer. As Shopify built it, they can answer it.
Try to re-formulate your question.
I highly doubt Shopify users will be able to change API endpoints within the Google app. Therefore, I think the easiest options are: